Recommendations for noise reduction in town planning

IS 4954 - Introduction: Key Points & Specifications

Purpose:

• IS 4954 provides guidelines for measuring and controlling train noise, especially in track cuttings.
• It references attenuation of sound levels and compares measured vs. calculated noise values.

Key Notes:

• Sound pressure levels reduce with distance from track and engine noise.
• Noise attenuation is affected by track geometry (e.g., deep cuttings reduce noise).
• Noise measurement distinctions:
  • Sound level meter readings (objective)
  • Perceived noise by human ear (subjective)

Important Table (Clause 4.75):
Shows distance vs. sound pressure level for train noise in a deep cutting, illustrating noise reduction.

Additional Specifications

• Rounding off values: Follow IS 2:1960 for rounding test/analysis results.
• Functional requirements: Defined by the Buildings Sectional Committee (BDC 12).

Summary Diagram of Noise Attenuation in Deep Cut Track

graph LR
A[Train Noise Source] --> B[No Cut - High Noise Level]
A --> C[Deep Cut Track]
C --> D[Reduced Noise Level (Measured)]
C --> E[Reduced Noise Level (Heard by Ear)]

Reference for Further Details

• IS 4954:1968 full document for detailed tables and measurement methods.
• IS 2:1960 for rounding and significant figures.

This introduction sets the foundation for noise control in railways using structural and acoustic design.

IS 4954 - Scope Summary

IS 4954 covers noise control in buildings, focusing on reducing noise at the source and through structural design.

Key Points on Scope:

• Applies to noise reduction measures in building construction.
• Specifies test and analysis rounding per IS 2-1960 for compliance.
• Draws on functional requirements for building noise control.

Important Specification:

• Rounding off values: Final test or calculated values must be rounded as per IS 2-1960, retaining the same significant figures as the specified values.

Typical Noise Control Measures (from Appendix A):

• Use of sound-absorbing materials.
• Design of barriers and enclosures.
• Structural modifications to reduce noise transmission.

Reference for Rounding (IS 2-1960):

flowchart LR
    A[Noise Source] --> B[Noise Control Measures]
    B --> C[Structural Design]
    B --> D[Material Selection]
    B --> E[Barriers & Enclosures]
    C --> F[Reduced Noise Transmission]
    D --> F
    E --> F

This standard guides noise reduction at source and through building design to ensure occupant comfort.

IS 4954: Sources of Noise – Key Details

1. Noise Levels from Typical Sources (Clause 2.3, Table 1)

2. Noise Source Characteristics (Clause 2.3)

• Noises can be periodical, continuous, or intermittent.
• Common community noise: temple/church bells, sirens, loudspeakers, hawkers, children playing.

3. General Noise Reduction Measures (Appendix A)

• Layout planning to separate noise sources from sensitive zones.
• Use of barriers, vegetation, and building orientation.
• Control at source by limiting noise generation.

Summary Diagram: Noise Source vs Distance and Noise Level

graph LR
A[Jet Take-off (300m)] -->|100-110 dB| B[High Noise]
C[Rail Traffic (30m)] -->|90-110 dB| B
D[Heavy Road Traffic] -->|80-90 dB| E[Moderate Noise]
F[Medium Road Traffic] -->|70-80 dB| E
G[Light Road Traffic] -->|60-70 dB| H[Low Noise]
I[Industries] -->|60-95 dB| E

Use these noise levels and source types for planning noise abatement and zoning in urban layouts per IS 4954.

IS 4954: Key Considerations for Layout & Location of Zones

1. Noise Level Classifications (Clause 3.1.1)

2. Acceptable Outdoor Noise Levels (Table 2)

3. Acceptable Indoor Noise Levels (Table 2)

4. Noise Levels of Typical Sources (Table 1)

IS 4954 (1968) - Recommendations for Noise Abatement in Town Planning

Though the standard primarily provides qualitative guidelines, key points include:

Key Recommendations:

• Zoning: Separate noisy industrial/commercial areas from residential zones.
• Buffer Zones: Use parks, green belts, or open spaces as noise buffers.
• Building Orientation: Position buildings so noise-sensitive facades face away from noise sources.
• Road Planning: Design roads to minimize traffic noise impact on residential areas.
• Land Use Planning: Allocate noisy activities away from schools, hospitals, and residential areas.

Typical Noise Limits (Indicative):

Noise Reduction Formulas:

• Noise Level Reduction by Distance:

[ L_2 = L_1 - 20 \log_{10} \left(\frac{r_2}{r_1}\right) ]

Where:

• (L_1) = noise level at distance (r_1)

• (L_2) = noise level at distance (r_2)

• Noise Barrier Insertion Loss:

[ IL = 10 \log_{10} \left( \frac{A_1}{A_2} \right) ]

Where:

• (IL) = insertion loss (dB)
• (A_1), (A_2) = sound absorption areas before and after barrier

Summary Diagram of Noise Abatement Planning

graph LR
A[Industrial Zone] -->|Noise| B[Buffer Zone (Green Belt)]
B --> C[Residential Zone]
C --> D[Schools / Hospitals]
A -.->|Noise Barrier| C

Use zoning, buffer zones, and barriers to reduce noise impact effectively.

IS 4954: Location of Aerodromes and Air Routes - Key Points

1. Location of New Aerodromes (Clause 4.1.1.1)

• New aerodromes should be located 6 to 8 km² away from city limits to:
  • Avoid residential construction nearby.
  • Accommodate safe glide angles of jet aircraft.
  • Allow future expansion.
• Noise disturbance can affect areas even up to 16 km from the aerodrome.
• Flight routes should avoid flying over densely populated towns.

2. Noise Level Considerations (Clause 3.1 & Table 2)

3. Layout Recommendations

• Segregate noisy sources (aerodromes, industries, railways) from residential and sensitive community areas.
• Plan air routes to minimize noise disturbance over populated zones.

flowchart LR
    A[New Aerodrome Location] --> B[6 to 8 km² Buffer Zone]
    B --> C[Residential Areas Beyond Buffer]
    A --> D[Avoid Flight Over Dense Towns]
    A --> E[Future Expansion Consideration]
    F[Noise Levels] --> G[Outdoor Noise Limits per Zone]
    F --> H[Indoor Noise Limits per Building Type]
    I[Planning] --> J[Segregate No

IS 4954: Key Points on Location of Aerodromes and Air Routes

1. Location of New Aerodromes (Clause 4.1.1.1)

• Aerodromes should be sufficiently away from cities.
• Allocate a boundary area of about 6 to 8 km² to:
  • Prevent residential construction nearby.
  • Accommodate jet airplane glide paths.
  • Allow future expansion.
• Noise disturbance can affect areas even 16 km away from the airport.
• Flight routes should avoid densely populated towns.

2. Noise Level Guidelines (Clause 3.1 & Table 2)

Summary Diagram: Aerodrome Location & Noise Zones

graph LR
    A[Aerodrome] --> B[6-8 km² Boundary Area]
    B --> C[No Residential Construction]
    A --> D[Flight Routes]
    D --> E[Avoid Dense Towns]
    F[Noise Impact Zone] -->|Up to 16 km| G[Residential Areas]
    style A fill:#f9f,stroke:#333,stroke-width:2px
    style B fill:#bbf,stroke:#333,stroke-width:1px
    style D fill:#bbf,stroke:#333,stroke-width:1px
    style F fill

IS 4954 Key Specifications for Location of Railway Stations, Rail Tracks, Highways, and Arterial Roads

1. Location Principles (Clause 4.1.2 & 3.2)

• Railway stations, yards, loco-sheds, bus/truck depots, and freight points must be located to minimize noise disturbance to residential and quiet community areas.
• Rail tracks, highways, and arterial roads should be routed away from residential and commercial zones.
• If connection to residential areas is necessary, use link roads and bypass routes.
• Noise abatement measures are required if rail lines are near residential zones.

2. Setback Distances (Clause 4.1.6)

• Minimum setback from rail tracks/highways to residential/commercial buildings on flat ground:
  50 to 75 meters.
• Increase setback if near marshalling yards or shunting areas operating day and night.
• Setback may be reduced if tracks/roads are in cuttings or if noise barriers/buildings intervene.

3. Noise Reduction by Track Design (Clause 4.75)

• Laying rails in deep cuttings reduces noise significantly.
• Noise attenuation depends on cutting dimensions and distance from source.

Summary Table: Minimum Setback Distances

Noise Abatement Methods (Examples from 4.1.2.1-4.1.2.3)

• Earth berms or embankments.
• Acoustic barriers or walls.
• Vegetative buffers or tree belts.

flowchart LR
    A[Railway Stations, Yards] --> B[Located away from residential areas]
    A --> C[Noise abatement measures if near residences]
    D[Rail Tracks, Highways] --> E[Prefer routing away from residential/commercial]
    D --> F[Setback distance 50-75m minimum]
    F --> G[Increased if near shunting yards]
    F --> H[Reduced if in cuttings or screened]

References:

• IS

IS 4954: Location of Industrial Areas - Key Points

1. Location Principles (Clause 4.1.3 & 3.2)

• Heavy/noisy industries (e.g., ship-building, locomotive workshops) must be located far from residential areas.
• Industrial zones should be segregated from residential and community areas to minimize noise, smoke, and odor disturbances.
• Industrial areas may be placed near railway stations, arterial roads for logistics.

2. Noise Level Guidelines (Clause 3.1 & Table 2)

3. Indoor Noise Levels for Buildings

4. Recommendations

• Segregate noisy industries with buffer zones or intervening industrial properties.
• Prioritize human health by minimizing noise exposure near residential/community zones.
• Location decisions may impact town economy but must favor public health.

flowchart LR
    A[Industrial Areas] --> B[Heavy & Noisy Industries]
    B -->|Far from| C[Residential Areas]
    A --> D[Near Railway & Arterial Roads]
    C --> E[Community & Residential Zones]
    style B fill:#f96,stroke:#333,stroke-width:2px
    style C fill:#bbf,stroke:#333,stroke-width:2px

This ensures effective zoning with noise control and urban planning harmony

IS 4954: Control of Industrial Noise in Existing Cities – Key Points

• Challenge: Shifting noise-producing industrial units away from residential/commercial areas is difficult in existing city layouts.
• Recommendation: Study and plan industrial shifts in stages to reduce noise impact.
• Future Control: Enforce local regulations to restrict new industrial/noise-producing units in sensitive zones.

Important Specifications (from IS 4954 and general practice):

*Values vary by local regulation; IS 4954 emphasizes planning and legislation over fixed numeric limits.

Noise Control Measures:

• Zoning: Separate industrial zones from residential/commercial.
• Buffer Zones: Use green belts or open spaces as noise barriers.
• Acoustic Barriers: Walls, enclosures around noisy equipment.
• Operational Restrictions: Limit working hours for noisy industries.

flowchart LR
    A[Existing City Layout] --> B{Noise Problem?}
    B -- Yes --> C[Study & Plan Industrial Shift]
    C --> D[Implement Stage-wise Shifting]
    D --> E[Enforce Local Regulations]
    E --> F[Prevent New Noise Sources in Sensitive Areas]

Summary: IS 4954 emphasizes planning, staged industrial relocation, and strict local laws to control industrial noise in existing urban areas rather than prescribing fixed numeric noise limits.

IS 4954: Location of Residential Areas — Key Points & Tables

Key Principles (Clause 4.1.5)

• Residential areas must be located in silent zones to minimize noise disturbance.
• Segregate residential zones from noisy sources such as industries, railways, highways, and aerodromes.
• Detailed planning should consider noise, odour, and other environmental factors.

Noise Level Guidelines (Clause 3.1 & Table 2)

Acceptable Indoor Noise Levels for Buildings

Summary for Residential Area Location:

• Choose quiet zones away from industrial and transport noise.
• Use noise level tables to ensure outdoor noise ≤ 45 dB(A) for urban residential.
• Plan buffer zones or green belts near noisy areas.
• Consider community facilities and their noise impacts.

flowchart LR
    A[Noisy Sources] -->|Buffer Zone| B[Residential Area]
    B --> C[Community Facilities]
    A --> D[Industrial Area]
    A --> E[Railways, Aerodromes]
    B -.-> F[Silent Zone]

This ensures quiet, healthy living environments per IS 4954 standards.

IS 4954: Layout Near Rail and Road Traffic - Key Points & Formulas

1. Setback Distances (Clause 4.1.6)

• Minimum setback: 50–75 m from railway tracks or main roads on flat ground.
• Increased setback: Required near marshalling yards or shunting areas (day & night operations).
• Reduced setback: Allowed if track/road is in a cutting or noise barriers/buildings intervene (see Appendix A).

2. Noise Control via Layout (Clause 4.1.2)

• Railways, stations, yards, highways should be routed away from residential/commercial zones.
• Use link roads and bypasses to reduce direct exposure.
• Noise abatement methods (4.1.2.1 to 4.1.2.3) include barriers, vegetation, and layout planning.

3. Noise Reduction by Barriers (Clause A-2.4)

• Deep-cut tracks (3.5 m depth, 45° sloping walls) reduce noise effectively.
• Typical noise reduction by barriers: 10 to 15 dB(A).
• Noise reduction increases with barrier height and distance from source.

4. Noise Level Attenuation with Distance

• Track noise at 32 km/h: ~3 dB reduction per doubling of distance.
• Freight track noise at 65 km/h: ~6 dB reduction per doubling of distance.

5. Typical Noise Levels (Clause 2.1.1)

6. Summary Table: Noise Reduction by Barrier Height & Distance

IS 4954: Location of Noisy and Quiet Buildings - Key Points

1. General Guidelines (Clause 4.1.7)

• Noisy buildings (stock exchanges, restaurants, mercantile offices) should be on main streets.
• Quiet buildings (hospitals, schools, dwellings) should be on side streets.
• Layout roads and freight points to minimize heavy vehicle noise impact.

2. Noise Zoning (Clause 3.1.1)

3. Acceptable Noise Levels (Table 2)

4. Design Recommendations (Clause 4.1.11.2)

• Offset buildings from roads to reduce noise.
• Place quiet rooms on the quieter side of the building.
• Use sound insulation: double doors/windows, artificial ventilation.
• Higher floors experience less noise than lower floors facing roads.

Summary Diagram: Building Location Strategy

graph LR
    A

Suitable Setback of Buildings from Roads (IS 4954)

Key Specifications:

• Minimum setback from main roads or railway tracks:
  50 to 75 meters (Clause 4.1.6)

  • Increase distance if near marshalling yards or continuous shunting operations.
  • Distance can be reduced if noise barriers or cuts exist.

• Setback purpose:
  To reduce noise intensity, as noise level decreases with distance from the source (Clause 4.1.8).

• Layout recommendation:
  Concentrate buildings centrally within the site, away from edges adjoining roads to minimize noise exposure.

Noise Level Guidelines (Clause 3.1, Table 2):

Practical Formula for Noise Reduction by Distance:

• Noise decreases approximately 6 dB(A) for every doubling of distance from the source.

Summary Diagram:

graph LR
A[Road / Railway Noise Source] --> B[Setback Distance 50-75 m]
B --> C[Building Setback]
C --> D[Reduced Noise Level]
D --> E[Improved Indoor/Outdoor Comfort]

In essence:
Maintain a minimum 50-75 m setback from noisy roads/railways, increase if heavy operations exist, and locate buildings centrally to minimize noise impact per IS 4954.

IS 4954: Location of Community Facilities – Key Points

1. Location Principles (Clause 4.1.11)

• Community facilities should be near residential areas for accessibility.
• Facilities are classified based on noise sensitivity and noise generation:
  • Some require highly quiet conditions (e.g., hospitals, broadcast studios).
  • Others generate noise only during certain periods (e.g., entertainment centers).
• Location must consider noise control and quietness requirements.

2. Noise Level Guidelines (Clause 3.1 & Table 2)

3. Layout Considerations (Clause 3.1 & 4.1.5)

• Segregate noisy sources (industries, railways, aerodromes) from residential and community zones.
• Plan silent zones for residential and noise-sensitive community facilities.
• Consider smoke, odour, and noise in zoning decisions.

Summary Diagram: Location Strategy for Community Facilities

graph LR
  Residential -->|Near| Community_Facilities
  Community_Facilities -->|Noise Sensitive| Quiet_Zones
  Community_Facilities -->|Noise Generating| Buffer_Zones
  Noisy_Sources -->|Separated from| Residential
  Noisy_Sources -->|Separated from| Community_F